Plane and Simple
A boy who is three feet tall puts a nail into a tree at his exact height. He returns two years later when he has grown by six inches and the tree has grown by twelve inches. How much taller is the nail than the boy?
Clue: The tree was normal and the boy was normal. Trees grow differently from boys.
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####Answer: The boy will be six inches taller than the nail. The tree grows from the top, so the nail won’t rise.